Why have yellow spots on cucumber leaf?

Probably, almost all gardeners are faced with the emergence of broad cucumber leaves yellow spots, after which the plant ceased to grow, to bear fruit, and soon all died. Moreover, such pattern is observed with the same frequency and in the open ground, and protected, it would seem, from the majority of greenhouse pests. Where does this attack and can it be overcome? Try to consider the reasons for having yellow spots on the leaves of cucumber, but at the same time and how to deal with them.

If we are talking about inexperienced in farming practices of the Amateur, we can assume a trivial blight. It occurs when in hot Sunny weather on the leaves is water. Rounded droplets create a lens effect, and the living tissue beneath them pierces through a focused solar beam, resulting in formation of spots on leaves of cucumber and their young fruits. That's why all the plants, and cucumbers in particular, it is recommended to water either early morning or in the evening to before heat the plants have time to dry. If this is not possible, it is advisable to use a bottom watering the aisles, leaving a relatively dry area around the stem to avoid root rot.

Another factor leading to disease, plants, – the shortage of some minerals in the soil. To yellowing greens could cause lack of potassium or magnesium, and it usually appears on older leaves. In this case, yellow spots on cucumber leaves usually appear first at the edges, and then gradually taking over the space between veins. If such a symptom is observed at one or more plants, it is urgent to conduct mineral fertilizer to protect others from premature aging.

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Where it will be difficult to cope with the various fungal diseases affecting both very young and formed a whip. The tread on the leaves of cucumbers and yellow spots pale in colour and rounded shape usually indicate infection with Anthracnose or askohitozom. He called a special fungus that prefers warm, humid environment. Special danger he represents in rainy periods and during an abundant fall of dew. This disease is also possible to observe appearance of dark-brown or black sunken spots on the petioles, stems and fruits of plants. Carriers of the fungus can be infected seeds and plants of native wintering in the soil. As surgical treatment can be applied spraying Phytosporin or 1% solution of Bordeaux fluid. And damaged plants in any case be left for the winter! They must as soon as possible to burn that remaining inside the stem spores are unable to influence the next landing.

Another dangerous disease, which appear yellow spots on the leaves of cucumber, is considered to be downy mildew or downy mildew. It usually develops during the period of active fruiting – in late July or early August – and manifests itself as small bright yellow dots. Over time, they increase, and then the leaf dies. Under favorable for fungus conditions (temperature extremes, high humidity, etc.) that infection is actively transferred to water during rain and irrigation and leads to plant death within 1-2 weeks after infection.

In Addition to mildew, yellow spots on cucumber leaf may cause mild mosaic virus. Despite the innocuous name, this disease has a high risk to plants, especially young ones. It acts as a carrier bocheva aphids overwintering in the roots of infected weeds. Chemical control of common mosaic does not yet exist, therefore, for its prevention to observe crop rotation and to get rid of weeds.